Online Feature

Much of Mars's surface is covered by fine-grained materials that hide the bedrock. The above bedrock is mostly exposed and it is in these areas that micrometeorites likely to accumulate.NASA/JPL-Caltech/Univ.

For many years, the Apple iPhone has been considered one of the most secure smart phones available. But despite this reputation, security issues that might affect millions of users came to light last week, when researchers at Google revealed they had discovered websites that can infect iPhones, iPads, and iPods with dangerous software.